What is the cause of pelvic stenosis?

summary

Pelvic stenosis is a condition that many women have experienced. The pelvic diameter line is too short or the shape is abnormal, which makes the pelvic cavity smaller than the limit of fetal presentation, hinders the decline of fetal presentation, and affects the smooth progress of labor. Narrow pelvis can be one or more short diameter lines, or one plane narrow or multiple planes narrow at the same time. When one diameter is narrow, we should observe the size of other diameters in the same plane, and then make a comprehensive analysis combined with the size and shape of the whole pelvis to make a correct judgment. So what's the matter with pelvic stenosis? Now let's share it with you.

What is the cause of pelvic stenosis?

There is also the treatment of narrow pelvis delivery must pay attention to, to clear the type and degree of narrow pelvis, understand the fetal position, fetal size, cervical dilatation, rupture of membrane or not, combined with age, parity, previous delivery history of comprehensive judgment, determine the mode of delivery.

It can also be judged by pelvic measurement. If there is no abnormality in pelvic lateral measurement, pelvic measurement should be carried out. For example, if the diagonal diameter is less than 11.5cm, the sacral promontory is protruding and the pelvic entrance plane is narrow, which belongs to flat pelvis. The middle pelvic plane stenosis and the pelvic outlet plane stenosis often coexist.

It can be judged by pelvic external measurement. For example, if the diameter line of pelvic external measurement is less than or equal to the normal value of 2cm, it is small pelvis, but the sacral external diameter is less than 18cm, it is flat pelvis. The diameter between ischial tubercles was less than 8 cm, and the angle of pubic arch was less than 90 °， For funnel-shaped pelvis, can be identified as pelvic stenosis.

matters needing attention

Because during childbirth, the pelvis is a constant factor. Narrow pelvis affects the descent and internal rotation of fetal position and fetal presentation in the delivery mechanism, and also affects uterine contraction. The pelvis is an important factor in estimating the difficulty of delivery.